Davey D40A Cast Iron Automatic Submersible Pump for Commercial Dewatering with Open Impeller

Rapid and automatic water removal for large-scale commercial pits, site ditches, and cellars is facilitated by the high-capacity Davey D40A. This high-performance model is frequently employed to maintain water levels in decorative water features and sub-surface structures where unattended operation is essential. The rugged construction is specifically suited for neutral pH liquids that may contain small soft solids, ensuring that site drainage systems remain functional. By providing a dependable solution for large-volume sump management, the unit protects property from rising water levels during heavy flooding events.

Performance is supported by a 0.4 kW motor that delivers an impressive maximum flow of approximately 240 L/Min and reaches a maximum head of 11.5 metres for vertical lift applications. The unit operates on a 240v supply with a 3.7 Amps run current, providing the high starting torque required to manage challenging fluid loads. This hydraulic profile ensures that substantial volumes of water are moved quickly and efficiently once the integrated preset length float switch activates. The motor is engineered to maintain stable hydraulic behavior and consistent pressure during high-demand commercial service duty.

The hydraulic heart of the pump is a cast iron open impeller engineered for both centrifugal efficiency and reliable solids handling. This design minimizes the risk of blockages when pumping grey water with suspended soft solids, ensuring the unit remains operational during critical flood protection cycles. The internal hydraulic path is carefully contoured to maintain high flow velocity, which helps keep the pump chamber clear of settled sediment and debris. This configuration allows for the safe passage of environmental impurities while preserving long-term volumetric efficiency in demanding drainage environments.

Structural longevity is provided by a 304 stainless steel motor shell and heavy cast iron pump body, which offer superior corrosion resistance in submerged service. Motor security is maintained by a double mechanical shaft seal in an oil bath featuring premium silicon carbide and ceramic faces to provide a barrier against abrasives. For operational security, the unit includes an automatic resetting thermal overload and a sand slinger lip seal to prevent damage from electrical or thermal stress. The assembly is completed with a 10-metre HO7RNF oil-resistant lead and an integrated 304 stainless steel lifting handle for easy deployment.

FEATURES

• High volume flow rate ensures rapid removal of water from large pits and commercial sumps.
• Integrated automatic float switch enables reliable unattended operation for flood protection.
• Double mechanical shaft seal with silicon carbide and ceramic faces provides superior motor insulation.
• Cast iron pump body and motor top offer extreme durability for commercial service duty cycles.
• Open centrifugal impeller design allows for the passage of soft solids without clogging the pump.
• Internal thermal overload with automatic reset protects the motor from electrical and thermal stress.
• Corrosive resistant 304 stainless steel motor shell extends the underwater service life.
• HO7RNF 10 metre oil resistant cable provides a robust and safe electrical connection.